Question about 1992 Chevrolet S-10 Blazer

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Runs good w/o EGR Valve but with EGR Valve connected idle is bad

I bought a new EGR valve but the same problem persists when the new valve is connected.....

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  • Anonymous Mar 31, 2014

    I just put a new EGR valve on and your car will run for about 30 35 minutes then it won't run

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  • Master
  • 1,450 Answers

What is the problem? sounds like you have an egr solenoid sticking you should not have vacuum at idle on valve

Posted on Dec 16, 2008

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How do you know if your EGR valve needs replacing?


Symptoms of a Bad EGR Valve ' AxleAddict

https://axleaddict.com > Auto Repair > DIY Auto Repair
Mar 8, 2018 - If the EGR Valve Sticks Open: A rough idle upon starting the engine (that is, when the engine is cold) and sometimes at a stop light or while looking for a spot in a parking lot (that is, at low engine speeds in a warmed-up engine). Stalling when the engine idles. Increase in fuel consumption.

Does your EGR valve need replacing? ' MicksGarage.com Blog

https://www.micksgarage.com/blog/does-your-egr-valve-need-replacing/ Aug 17, 2017 - Before removing anything, check that the replacement EGR valve you've bought looks identical to the old one with the same connections and fittings. If the EGR valve has vacuum pipes to it, label them before twisting and pulling the pipes off by hand, being careful not to break or stretch them too much.

Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve ...

https://www.yourmechanic.com > Articles Jan 7, 2016 - If the computer detects an issue with the vehicle's EGR valve circuit or position, it will set off the Check Engine Light in order to notify the driver of the issue. ... the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the vehicle needs an EGR valve replacement.

Signs of a Bad EGR Valve - RepairPal

https://repairpal.com > Encyclopedia > Exhaust and Emissions Jul 4, 2008 - A scan tool will show both trouble codes and live data related to the EGR valve. It may also have a function for remote EGR valve control. A valve that is found to be bad should be replaced. If EGR-related problems persist after valve replacement, the issue may be the EGR passages in the intake manifold or ...

Symptoms of a bad egr valve how to change a bad egr valve - YouTube

? 4:55
https://www.youtube.com/watch?v=xE4AkXL3s84 Mar 5, 2017 - Uploaded by Alexander Dobosiewicz
so that's never good I can constrict it in fact the performance. then we actually scrubbing that off of there ...

What Are The Symptoms Of A Bad EGR Valve? - YouTube

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https://www.youtube.com/watch?v=NQ4RxrQR8Es
Jul 17, 2017 - Uploaded by clever sparky
The exhaust gas recirculation (egr) valve is a relatively new part of the car and can be found on newer ...

What Are the Signs of a Bad EGR Valve? - NAPA Know How Blog

knowhow.napaonline.com/signs-bad-egr-valve/ Sep 5, 2017 - A bad EGR valve is no longer able to control emissions and drastically reduces fuel economy. Here are the signs that you need to get yours looked at.

Apr 27, 2018 | Cars & Trucks

2 Answers

What is a EGR valve & IAC valve & where are they located?


Here's a picture of your egr valve,located by firewall.Here's your iac.

Jan 17, 2013 | 2000 Chrysler Concorde

1 Answer

What is a egr valve


  1. Install a tachometer on the engine, following the manufacturer's instructions.
  2. Detach the engine wiring harness connector from the Idle Air Control (IAC) solenoid.
  3. Disconnect and plug the vacuum supply hose from the EGR valve.
  4. Start the engine, then apply the parking brake, block the rear wheels and position the transmission in Neutral.
  5. Observe and note the idle speed.
If the engine will not idle with the IAC solenoid disconnected, provide an air bypass to the engine by slightly opening the throttle plate or by creating an intake vacuum leak. Do not allow the idle speed to exceed typical idle rpm.
Using a hand-held vacuum pump, slowly apply 5-10 in. Hg (17-34 kPa) of vacuum to the EGR valve nipple.
  1. If the idle speed drops more than 100 rpm with the vacuum applied and returns to normal after the vacuum is removed, the EGR valve is OK.
  2. If the idle speed does not drop more than 100 rpm with the vacuum applied and return to normal after the vacuum is removed, inspect the EGR valve for a blockage; clean it if a blockage is found. Replace the EGR valve if no blockage is found, or if cleaning the valve does not remedy the malfunction.


EGR Valve Removal & Install
3.0L OHV (2 valve) and 3.4L SHO engines

b9175c5.jpg

Fig. : EGR mounting-3.0L OHV (2 valve) engine

5fcd84e.jpg

Fig. : EGR mounting-3.4L (SHO) engine

4552fc2.jpg

Fig. : Remove the two retaining bolts and...

b849310.jpg

Fig.: ... remove the valve from the intake manifold

795549d.jpg

Fig.: Thoroughly clean the mating surfaces of the manifold and the EGR valve (if being reused)
  1. Disconnect the negative battery cable.
  2. Remove the vacuum hose from the EGR valve.
  3. Using a 22mm wrench or crowfoot, disconnect the EGR valve-to-exhaust manifold tube from the EGR valve.
  4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
  5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
To install:
  1. Install the EGR valve, along with a new gasket, on the upper intake manifold, then install and tighten the mounting bolts to 15-22 ft. lbs. (20-30 Nm).
  2. Connect the EGR valve-to-exhaust manifold tube to the valve, then tighten the tube nut to 26-47 ft. lbs. (35-65 Nm).
  3. Connect the vacuum hose to the EGR valve.
  4. Connect the negative battery cable.

3.0L OHC (4 valve)

d8a563e.jpg

Fig. : EGR mounting-3.0L OHC (4 valve) engine
  1. Disconnect the negative battery cable.
  2. Remove the vacuum hose from the EGR valve.
  3. Remove the two EGR tube-to-EGR valve retaining nuts.
  4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
  5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
To install:
  1. Install the EGR valve, along with a new gasket, on the upper intake manifold, then install and tighten the mounting bolts to 15-22 ft. lbs. (20-30 Nm).
  2. Connect the EGR valve-to-EGR tube, then tighten the retaining nuts.
  3. Connect the vacuum hose to the EGR valve.
  4. Connect the negative battery cable.

Tell us news.

Oct 12, 2012 | 1998 Nissan Maxima

2 Answers

Replaced egr valve pressure sensor upstream and downstream oxygens sensors egr tube new egr valve new idle air control valve runs fine and idles fine one minute then starts idleing rough and dies starts...


r u gonna keep replacin parts-or do a scan 1st--not all problems show on a readout-like vacuum leaks or a failin computer--throttle body probly needs cleanin

Sep 06, 2010 | 1996 Ford Explorer

3 Answers

How many fuel pumps does a 93 saturn sl2 have? ours will not idle. we have replaced the fuel filter, but are curious about the fuel pump or a possible clog in the fuel line. if we keep our foot on the gas,...


Clogged line is not in reality, It only has 1 fuel pump, And if it runs with foot on gas its not bad. Your issue will be more likely a vacume leak or idle air motor, And in my experiance its the Idle air motor, It has 2 screws and very easy to change,

Jun 13, 2010 | 1993 Saturn SL2

3 Answers

EGR Valve not working


EGR Valve Testing
  1. Install a tachometer on the engine, following the manufacturer's instructions.
  2. Detach the engine wiring harness connector from the Idle Air Control (IAC) solenoid.
  3. Disconnect and plug the vacuum supply hose from the EGR valve.
  4. Start the engine, then apply the parking brake, block the rear wheels and position the transmission in Neutral.
  5. Observe and note the idle speed.
If the engine will not idle with the IAC solenoid disconnected, provide an air bypass to the engine by slightly opening the throttle plate or by creating an intake vacuum leak. Do not allow the idle speed to exceed typical idle rpm.
Using a hand-held vacuum pump, slowly apply 5-10 in. Hg (17-34 kPa) of vacuum to the EGR valve nipple.
  1. If the idle speed drops more than 100 rpm with the vacuum applied and returns to normal after the vacuum is removed, the EGR valve is OK.
  2. If the idle speed does not drop more than 100 rpm with the vacuum applied and return to normal after the vacuum is removed, inspect the EGR valve for a blockage; clean it if a blockage is found. Replace the EGR valve if no blockage is found, or if cleaning the valve does not remedy the malfunction.


EGR Valve Removal & Install
3.0L OHV (2 valve) and 3.4L SHO engines

b9175c5.jpg

Fig. : EGR mounting-3.0L OHV (2 valve) engine

5fcd84e.jpg

Fig. : EGR mounting-3.4L (SHO) engine

4552fc2.jpg

Fig. : Remove the two retaining bolts and...

b849310.jpg

Fig.: ... remove the valve from the intake manifold

795549d.jpg

Fig.: Thoroughly clean the mating surfaces of the manifold and the EGR valve (if being reused)
  1. Disconnect the negative battery cable.
  2. Remove the vacuum hose from the EGR valve.
  3. Using a 22mm wrench or crowfoot, disconnect the EGR valve-to-exhaust manifold tube from the EGR valve.
  4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
  5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
To install:
  1. Install the EGR valve, along with a new gasket, on the upper intake manifold, then install and tighten the mounting bolts to 15-22 ft. lbs. (20-30 Nm).
  2. Connect the EGR valve-to-exhaust manifold tube to the valve, then tighten the tube nut to 26-47 ft. lbs. (35-65 Nm).
  3. Connect the vacuum hose to the EGR valve.
  4. Connect the negative battery cable.

3.0L OHC (4 valve)

d8a563e.jpg

Fig. : EGR mounting-3.0L OHC (4 valve) engine
  1. Disconnect the negative battery cable.
  2. Remove the vacuum hose from the EGR valve.
  3. Remove the two EGR tube-to-EGR valve retaining nuts.
  4. Remove the EGR valve mounting fasteners, then separate the valve from the intake manifold.
  5. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
To install:
  1. Install the EGR valve, along with a new gasket, on the upper intake manifold, then install and tighten the mounting bolts to 15-22 ft. lbs. (20-30 Nm).
  2. Connect the EGR valve-to-EGR tube, then tighten the retaining nuts.
  3. Connect the vacuum hose to the EGR valve.
  4. Connect the negative battery cable.

Tell us news.

May 04, 2010 | 1999 Mercury Sable

1 Answer

1999 f250 soon as engie warms up a little starts sputtering real bad shut off awhile and runs good for a few minutes then starts sputtering again


check egr valve make sure it is not being opened at Idle when warm generally you can see the rod for the valve through the holes on the valve when warm watch the valve raise rpm approx. to 2000rpm you should see that rod move up let off it should rest again at idle, If it is stuck up or if the vacuum solenoid is some how failing and letting vacuum to the egr valve at warm idle opening it will cause an extremely poor Idle, this of course may not be it but theres a good chance. if you can see inside the egr to the rod for the valve, It could help you diagnose it as an egr problem or let you know to look elsewhere

Mar 27, 2010 | 2001 Ford F250 Super Duty Super Cab

1 Answer

It starts and runs good and smooth until it gets warm then it cuts out and dies. Someone said it could be the ERG valve is that true


Its either your EGR valve and sensor or its the TFI module.
Does it idle good? Then its the TFI module
Does it idle bad rev up and down ? Then its the EGR valve and EVP sensor.

Jun 15, 2009 | 1987 Ford Bronco

1 Answer

Only runs ruff during park and idle.


Your EGR valve shouldn't open up during idle or the engine will run rough and may even stall. Remove it and clean the plunger and port with a wire brush and some carb cleaner. Test the diaphragm with a vacuum pump. If it doesn't work after cleaning, or the diaphragm is bad, buy a new EGR valve.

Feb 06, 2009 | 2001 Mercury Cougar

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